Question

七年级英语，动词不定式的用法，在什么时候用？求高人解

什么时候用！！！！！！

Answer 1

不定式有很多用法，没有完全固定之说，如一些固定结构（have to do），或用于做目的状语从句（I go home to have lunch)，以及做修饰语（something to drink）。不过若一个句子中有两个行为动词一般都是用不定式连接。希望能对你有帮助
用法如下：
不定式作宾语

1) 动词+ 不定式
afford aim appear agree arrange ask be decide bother care choose come dare demand desire determine expect elect endeavor hope fail happen help hesitate learn long mean manage offer ought plan prepare pretend promise refuse seem tend wait wish undertake
举例：
The driver failed to see the other car in time.
司机没能及时看见另一辆车。
I happen to know the answer to your question.
我碰巧知道你那道问题的答案。

2）动词+不定式 ； 动词+宾语+不定式
ask, beg, choose, expect , hate, help intend like, love, need prefer, prepare, promise, want, wish…
I like to keep everything tidy. 我喜欢每件东西都保持整洁。
I like you to keep everything tidy. 我喜欢你年使每件东西都保持整洁。
I want to speak to Tom. 我想和汤姆谈话。
I want you to speak to Tom. 我想让你和汤姆谈话。

3） 动词+疑问词+ to
decide, know, consider forget, learn, remember, show, understand, see, wonder, hear, find out, explain, tell
Please show us how to do that. 请演示给我们如何去做。
There are so many kinds of tape-recorders on sale that I can't make up my mind which to buy.有这么多的录音机，我都拿不定主意买哪一种。

注意:疑问词带不定式在句中作成分时，谓语动词用单数。
The question is how to put it into practice.
问题是怎样把它付诸实施。
二、作补语
1) 动词+宾语+不定式(to do)
例句： a. Father will not allow us to play on the street. 父亲不让我们在街上玩耍。
2) to + be 的不定式结构，作补语的动词
We consider Tom to be one of the best students in our class. 我们认为汤姆是班上最好的学生之一。
3) to be +形容词 The book is believed to be uninteresting. 人们认为这本书没什么意思。 4) there be+不定式
三、作主语
1） It's easy (for me) to do that.我做这事太容易了
四、作表语
不定式可放在系动词（例如be动词）后面，形成表语。例如： My work is to clean the room every day. His dream is to be a doctor.
五、作定语
不定式做定语通常要放在被修饰的词后。例如： I have a lot of work to do. So he made some candles to give light.
编辑本段六、作状语
1）目的状语 To… only to (仅仅为了), in order to, so as to, so(such)… as to… (如此……以便
2）作结果状语，表事先没有预料到的，要放在句子后面。 What have I said to make you angry. He searched the room only to find no
3) 表原因 I'm glad to see you.
七、省to 的动词不定式
1） 情态动词 ( 除ought 外，ought to)： 2） 使役动词 let, have, make： 3） 感官动词 see, watch, look at, notice , observe, hear, listen to, smell, feel, find 等后作宾补，省略to。

Answer 2

不定式作宾语

1) 动词+ 不定式
afford aim appear agree arrange ask be decide bother care choose come dare demand desire determine expect elect endeavor hope fail happen help hesitate learn long mean manage offer ought plan prepare pretend promise refuse seem tend wait wish undertake
举例：
The driver failed to see the other car in time.
司机没能及时看见另一辆车。
I happen to know the answer to your question.
我碰巧知道你那道问题的答案。

2）动词+不定式 ； 动词+宾语+不定式
ask, beg, choose, expect , hate, help intend like, love, need prefer, prepare, promise, want, wish…
I like to keep everything tidy. 我喜欢每件东西都保持整洁。
I like you to keep everything tidy. 我喜欢你年使每件东西都保持整洁。
I want to speak to Tom. 我想和汤姆谈话。
I want you to speak to Tom. 我想让你和汤姆谈话。

3） 动词+疑问词+ to
decide, know, consider forget, learn, remember, show, understand, see, wonder, hear, find out, explain, tell
Please show us how to do that. 请演示给我们如何去做。
There are so many kinds of tape-recorders on sale that I can't make up my mind which to buy.有这么多的录音机，我都拿不定主意买哪一种。

注意:疑问词带不定式在句中作成分时，谓语动词用单数。
The question is how to put it into practice.
问题是怎样把它付诸实施。

Answer 3

表目地时用